Re: seeking Motorola M68MM01A2 documentation
On 19.01.22 13:15, Jonathan Chapman via cctalk wrote: That's a neat board! Where can I/we order one? With me... 20 Eur for the set of 2 + shipping. If you are in the US it is probably cheaper to order new ones locally. Note that I never completed the documentation or wrote the code for the hex keyboard. But it does run the Tektronix board-bucket BASIC via serial port ! Find more on ftp://ftp.dreesen.ch/TEK_BB Jos
Re: TU58 / DECtape II: Capstan goo
which Innoflex filament? There are several different hardness variants. I used Ninjaflex 3DNF0517505, but that is because it is the only TPU type filament I have at hand. I would rather use a somewhat harder variant. Jos
Re: TU58 / DECtape II: Capstan goo
Also, when the tapes arrive, are there recommendations in case their
drive belts are gone?
You can 3D-print replacements.
Use Innoflex filament, 100% fill-in and the following OpenScad formula :
module ring(d1,d2,w)
{
difference()
{ cylinder( w, d1/2, d1/2, $fn=230);
cylinder( w, d2/2, d2/2, $fn=230);
}
}
ring(38.2,35,6); // TU60 Dectape-II
Already 2 TU60 have been repaired with the above.
Jos
Re: Micropolis 1525 stuck heads
On 22.09.21 13:46, Jules Richardson via cctalk wrote: On 9/20/21 1:13 AM, Chris Zach via cctalk wrote: Running it through the MFM tool got all but 200 or so sectors on the first pass, most errors were on head 3 but tapered off after cyl 500. Seems like a normal copy of Accent, no special information so it might not be worth taking the world apart to get it working. What's this "MFM tool" of which you speak? Something specific to the PERQ world? I've got various ST506/412-type drives formatted against various controllers in various systems that might benefit from a snapshot. David Gesswein's MFM-reader : https://www.pdp8online.com/mfm/mfm.shtml
Re: head alignment tape
On 30.03.21 21:13, Curious Marc wrote: Can’t see the web page, it’s blocked. But yes, I could definitely use an alignment taoe. Marc Sorry all, Did not realize that site was geoblocked, it is some sort of local (i.e. Swiss) Craigslist. I will not copy the whole advert, but this is what is for sale ( 50 CHF, around 60 USD for all 5 tapes ) 1 Stk. Pericomp Master Head Alignement Tape 1 Stk. Memorex IV Quantum-CX 6250 DPI 1 Stk. Memorex Quantum-CX 2 Stk. Univac Testtape Note that I am not the seller, just want to point out what I believe is a rare item Jos
head alignment tape
Does this head alignment tape need saving ? https://www.tutti.ch/de/vi/zuerich/computer-zubehoer/komponenten-zubehoer/5-stk-vintage-computer-tapes-memorex-pericomp-etc/43582741 I'd be inclined to think that the alignment tape would suffer to same issues as all old tapes, but then this is rare enough to be mentioned here. Jos
Re: Help with PCB ID
On 13.03.21 20:43, Cory Heisterkamp via cctalk wrote: I’m wondering if anyone recognizes this PCB. Double-sided, 74xx vintage, measuring 14”x15”. There’s a “B.I.” logo in one corner, but no google match. IC date codes are ’77/’78 vintage. There’s a pair of DB-25’s, a BCD encoder, and for some reason, two pots. DC rectification appears to take place onboard. I thought perhaps the 112-7753 marking might be a part or catalog number, however the flip side is marked 112-1754, so perhaps not. Anyone recognize it? -Cory https://photos.app.goo.gl/dogAPxn7vLV87YRw9 The exact same board is currently laying on my bench awaiting repair. It comes out a Cromemco 3101, which is indeed a rebadged Beehive B100 Jos
Re: Wagner WAC40
On 13.03.21 09:17, Joshua Rice via cctalk wrote: Hi, I recently bought a core rope memory unit from a Wagner WAC40, mainly because it’s very aesthetically pleasing and looks good on display: https://i.redd.it/h9sb550uhnm61.jpg However, i can fine very little about Wagner Computer, the WAC40 (and WAC12), or the man behind the company, Günter Wagner. Does anyone have any info on any of these subjects? This links seems to be all i can find: https://blog.hnf.de/gauner-gelder-und-computer/ Thanks, Josh Rice It seems to have been a very shady operation. This article https://www.computerwoche.de/a/es-ist-substanz-da,1204762 suggest that about 120 machines were made. This article https://www.computerwoche.de/a/keiner-holt-den-computer-ab,1203597 claims that the machine never worked, the seller disappeared overnight, and due taxation on employee salaries were never paid. Wagner core memories to seem to come up every now and then. Maybe ask the seller where they came from ? Jos
Stride computers, was Re: Rod Coleman's personal history of founding, building & running SAGE
On 03.01.21 01:11, Liam Proven via cctalk wrote: This may be old news -- it was new to me, though. https://suddendisruption.blogspot.com/search/label/Booting%20Sage%20Computer The story is around for several years already, but yes : interesting read indeed. Speaking of which : I am currently restoring 3 Stride 420 machines, the follow-up to the Sage machines. Anyone has CP/M or PSystem IV.2.2 disks for these, and would like to share ? ( I have PSystem IV.2.1 and PDOS ) Also a copy of UniStride, the UNIX-V for the Stride 440 / 460 would be welcome. I would need top reconstruct the MFM controller for UNIX use, but that would not be unsurmountable. Jos
Re: Unknown 1970 Tapedrive
On 29.04.19 22:28, Chuck Guzis via cctalk wrote: On 4/29/19 12:56 PM, Jos Dreesen via cctalk wrote: 1970, also all TTL is dated 1969 or 1970. Jos That would fit right in with a key-tape scheme. Can you tell if the capstan motor is a stepper? --Chuck I put up some more pics (Tapehead & capstan drive). It does not use stepper. It seems it was made by US firm Sangamo, as is etched in some of the PCB's In view of the head's condition I will not persue this further. Jos
Re: Unknown 1970 Tapedrive
What's the date on the paddle board? Could almost be a key-to-tape drive. --Chuck 1970, also all TTL is dated 1969 or 1970. Jos
Re: Unknown CDC unit , looks like a drum memory ?
On 16.05.2018 20:00, Al Kossow via cctalk wrote: Honeywell Level 66 CP http://ana-3.lcs.mit.edu/~jnc/tech/multics/jpg/L66CPUL.jpg That seems to be spot on... What a beast this machine was.. Jos
Re: Unknown CDC unit , looks like a drum memory ?
On 16.05.2018 19:13, Ed Sharpe via cctalk wrote: OK I see there is a mix of photos in this directory! some tape reader some drum 2 separate topics. My mistake, sorry, that papertape reader was of course obvious. Removed that pic. Added 4 more, that are from some frontpanel that probably is also CDC. Quite easily the most complex I have ever seen, but somehow strange. Maybe for a tester rather than a computer. I am afraid that the local situation made better fotos impossible... Thanks for your input Jos
Univac 9400 panel ( Was:Re: Will be up for sale in this calendar year 360 Front Panel)
On 22.02.2018 18:56, Pete Lancashire via cctalk wrote: I thought I would post a heads for https://photos.app.goo.gl/36CxlZQJDssj5uLh1 I have the IBM 360 aluminum plate that goes on top, it is scratched. More detailed and better pictures as I dig deeper. ...and if someone needs a nice Univac 9400 console to go with that, I have one doing nothing in my basement. Good condition, but flatcables cut. Located in Switzerland I'm afraid. Was planning to one day add an FPGA behind it, but I now realized that I have enough on my classiccmp plate as it is... Jos
Re: Can you run Apple Lisa Workshop and LIsa OS on the same Hard-drive?
On 28.01.2018 16:25, Adrian Graham via cctalk wrote: On 28 Jan 2018, at 11:09, corey cohen via cctalk wrote: Or do I need an external profile for my 2/10 if I want to still use LOS. One alternative is to go for an IdeFile : my Lisa has a 260MB IDE harddisk, seven partitions, and 6 different OS's installed. All internally. Not very original, but handy indeed. Jos
Re: Tek 40xx computer users
On 07.01.2018 07:01, Randy Dawson via cctalk wrote: This was for Mike Hass, he was not in the email chain, and I do not have his address. But it' s a general shout out to the other Tek 40xx users out there... There are a number of us over and the vcfed forum, someone just brought his 4052 back to live after countless years. I myself restored my 4052 a couple of months ago, a second one needs powersupply checkout and has an as yet undetermined problem in the analog board. I am in the process of recreating the 4052/4054 diagnostic pack. Give a shout if you need one, less than 7 parties at the moment. I'd therefore be interested in the source code for the 3D printed cartridge case. This will need updates to accomodate the LED and switches. I myself would be interested in obtaining, or recreating, a suitable long term storage option for the 4052, i.e. floppy or even SD card. Then again, TekBasic is really bloody awful, maybe we should spend time on brining somre proper software top the system. Jos
Re: To the 2901 bit slicers out there
On 28.12.2017 05:35, Randy Dawson via cctalk wrote: Since I know there's tons of PDP/11 geniuses here, and other gurus with a NOVA 4, and a Tektronix 4052 guy (I have the 4051): What have you done, with microprogramming this part? In your architecture, have you changed the microcode, create an instruction to enhance your machine? I changed the microcode in my 2901-based ETH Lilith such that it can use an ATA-harddisk instead of the unobtainium SD-120 Mididisk. It works in my Lilith emulator Emulith, sadly the real Lilith is still down with other issues so it has not been tested with the real hardware. What about the coding tools? ADASM? Looks long gone, how do you do microcode today? As is to be expected the Lilith came with its own modula-2 based coding tool. I wipped up another one in C. Note that this is a lilith-microcode assembler, as it covers more than just the 2901. I would expect this to be the case for other machines as well. All tools & microcode and emulators are on my FTP site Jos
Re: That Tek 405x QIC Tape.
On 03.10.2017 16:59, Al Kossow via cctalk wrote: On 10/3/17 2:50 AM, Jos Dreesen via cctalk wrote: That "famous" QIC tape unit Tektronix 405x tapes aren't QIC They are 3M DC series cartridges, but the encoding is not a QIC standard. The problems, alas, are the same.
That Tek 405x QIC Tape.
That "famous" QIC tape unit ...has been talked about a lot, still some things are still not clear to me. Baking : is this a last-resort means of reading some valuable tape, or a means to restore them for a further few years of usage ? I intend to bake mine before usage, although a few unused, still shrinkwrapped, tapes seem to be in excellent condition, including tensioning belt. Those I might try without baking. The belt : is the elastibands method usable for more than a few reads/writes, or is robbing belts from 6150's really the only way ? Belts seem to come in 2 guises : black belts, often dead and somewhat sticking to the magtape itself, and smaller white belts, always broken, and bonded firmly to the magnetic coating. Sadly all my Tek Library and Test tapes are of the latter variant. Al is maintaining a set of ROM images for these machines, are tape images covered somewhere ? Do we have an fixed tape image format, as has been done with Dave's IMD for floppies ? Background : currently in the process of restoring both my 4052's. Have the maintenance manual and spares, so there is hope. But ideally I would also like to keep using the cartidge drive. Fool's errant or workable option ? Jos
